Ranktracker proxies

I am using link ranktracker to find rankings, but having problems with the proxies as the quickly go dead. ( I have done human emulation. I need to track more than 300 KW) I subscribe to private proxies that work well with scrapebox.
Do I need a software that can grab more proxies? which software do you recommend?
or do I need to subscribe to a different proxy service?

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